How long must hand-operated metering faucets remain open at a minimum?

Hand-operated metering faucets are designed to provide a specified volume of water when activated, and they automatically shut off after a predetermined duration. The minimum requirement for such faucets to remain open is critical for ensuring adequate sanitation and proper hygiene practices, especially in public restrooms.

The requirement for a minimum of 10 seconds allows sufficient time for users to effectively wash their hands, as handwashing guidelines generally emphasize washing for at least 20 seconds to reduce the presence of pathogens. However, the operation of metering faucets is influenced by user behavior and the need to balance water conservation with effective handwashing.

By setting the minimum at 10 seconds, it encourages compliance with handwashing practices while still promoting water efficiency, which is vital in plumbing codes and standards. This duration reflects a compromise designed to facilitate proper hygiene without excessive water waste. Therefore, 10 seconds is a practical and justifiable standard for the operation of hand-operated metering faucets in order to maintain a satisfactory level of cleanliness while considering water conservation.